Gas compressor

Abstract

The utility model provides a gas compressor. The gas compressor comprises an impeller, an impeller back plate, a rotor, a bearing seat, a first radial bearing, a thrust bearing assembly and a motor. The motor drives the rotor to rotate; a rotor of the motor sequentially penetrates through the bearing seat, the first radial bearing, the thrust bearing assembly, the impeller back plate and the impeller in the axial direction. The impeller back plate and the impeller are oppositely arranged in the axial direction, leakage airflow exists between the impeller back plate and the impeller, and the leakage airflow flows through an air film of the thrust bearing assembly and an air film of the first radial bearing. A first cooling liquid channel is formed in the impeller back plate, and cooling liquid circulates in the first cooling liquid channel so as to cool leaked airflow. The cooling liquid in the first cooling liquid channel in the impeller back plate cools leaked airflow by cooling the structure, and the cooled leaked airflow has higher cooling capacity, so that cooling of the thrust bearing assembly and the first radial bearing is enhanced, and the service life of the thrust bearing assembly is prolonged. The problem that an air bearing of an air compressor in the prior art is prone to overtemperature failure is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a compressor. BACKGROUND

[0002] The compressor is a kind of turbine, mainly used for compressing gas, increasing the pressure of gas, which is widely used in various fields. The compressor transmits kinetic energy to the gas through rotating blades, thereby increasing the pressure and temperature of the gas. Due to the high speed of the impeller of the compressor, the air bearing as a rotating support will generate a large amount of heat due to the friction between the air film and the air bearing. The heat accumulation causes local high temperature of the bearing, affecting the operation and durability of the bearing, and the air bearing is prone to over-temperature failure. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a compressor to solve the problem of over-temperature failure of the air bearing of the compressor in the prior art.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme:

[0005] A compressor, comprising an impeller, an impeller back plate, a rotor, a bearing seat, a first radial bearing, a thrust bearing assembly and a motor.

[0006] The motor drives the rotor to rotate.

[0007] The rotor is sequentially arranged in the bearing seat, the first radial bearing, the thrust bearing assembly, the impeller back plate and the impeller along the axial direction.

[0008] The impeller back plate and the impeller are arranged opposite along the axial direction, and there is a leakage airflow between the impeller back plate and the impeller, and the leakage airflow flows through the air film of the thrust bearing assembly and the air film of the first radial bearing.

[0009] The impeller back plate is provided with a first cooling liquid channel, and cooling liquid flows through the first cooling liquid channel to cool the leakage airflow.

[0010] Optionally, a machine shell is arranged around the motor, the bearing seat is assembled and connected with the machine shell, and a second cooling liquid channel is arranged between the bearing seat and the machine shell, and cooling liquid flows through the second cooling liquid channel to cool the motor.

[0011] Optionally, the diffuser located on the side of the impeller is provided with a diffuser outlet capable of guiding cooling airflow.

[0012] The impeller back plate is provided with a through air channel communicated with the diffuser outlet.

[0013] The shell is provided with a cooling air channel which is in communication with the air passage and extends along the axial direction of the shell.

[0014] The side of the rotor away from the impeller is provided with a second radial bearing, and the cooling air channel can guide the cooling air flow to the second radial bearing to cool the second radial bearing.

[0015] Optionally, the cooling air channel comprises a plurality of sub-air channels arranged along the circumferential direction of the shell, and all the sub-air channels are in series communication.

[0016] Optionally, the outlet of the cooling air channel is arranged on the circumferential side of the shell.

[0017] Optionally, the motor is provided with the second cooling liquid channel along the circumferential direction and the axial direction.

[0018] Optionally, the second cooling liquid channel is arranged on the side of the bearing seat facing the shell, and the bearing seat and the shell are sealingly assembled.

[0019] Optionally, the end of the motor facing the impeller back plate is provided with a waterproof adhesive layer.

[0020] Optionally, the thrust bearing assembly comprises:

[0021] a first thrust bearing connected with the impeller back plate;

[0022] a second thrust bearing coaxially arranged with the first thrust bearing and connected with the shell;

[0023] a thrust disc located between the first thrust bearing and the second thrust bearing, and the central part of the thrust disc protrudes axially from the first thrust bearing and the second thrust bearing;

[0024] wherein the shaft shoulder of the rotor abuts the thrust disc along the axial direction.

[0025] Optionally, the impeller back plate is a combined structure comprising at least a first part and a second part, and the first part and / or the second part is provided with the first cooling liquid channel on the side opposite to the axial direction.

[0026] The compressor provided by the application comprises an impeller, an impeller back plate, a rotor, a bearing seat, a first radial bearing, a thrust bearing assembly and a motor. The motor drives the rotor to rotate. The rotor of the motor is sequentially arranged in the bearing seat, the first radial bearing, the thrust bearing assembly, the impeller back plate and the impeller along the axial direction. The impeller back plate is arranged opposite to the impeller along the axial direction, and there is a leakage airflow between the impeller back plate and the impeller. The leakage airflow flows through the air film of the thrust bearing assembly and the air film of the first radial bearing. The impeller back plate is provided with a first cooling liquid channel, and cooling liquid flows in the first cooling liquid channel to cool the leakage airflow.

[0027] In this way, the first radial bearing and the thrust bearing assembly form air films when they are used as air bearings. When the compressor is running, the leakage airflow flows out of the space between the impeller and the impeller back plate. The leakage airflow will pass through the air film of the thrust bearing assembly and the air film of the first radial bearing due to the formation of the air films. At the same time, the cooling liquid in the first cooling liquid channel in the impeller back plate cools the leakage airflow by cooling the structure. The cooled leakage airflow has stronger cooling capacity, thereby enhancing the cooling of the thrust bearing assembly and the first radial bearing, and solving the problem of over-temperature failure of the air bearings of the compressor in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0029] Figure 1 A partial schematic view of the compressor from a sectional view angle is provided for the embodiments of the application.

[0030] Figure 2 A schematic view of the position relationship between the motor and the second cooling liquid channel of the compressor is provided for the embodiments of the application.

[0031] Figure 3 Another partial schematic view of the compressor from another sectional view angle is provided for the embodiments of the application.

[0032] Figure 4 A partial perspective schematic view of the compressor is provided for the embodiments of the application.

[0033] In Figures 1-4 , the compressor comprises an impeller, an impeller back plate, a rotor, a bearing seat, a first radial bearing, a thrust bearing assembly and a motor. The motor drives the rotor to rotate. The rotor of the motor is sequentially arranged in the bearing seat, the first radial bearing, the thrust bearing assembly, the impeller back plate and the impeller along the axial direction. The impeller back plate is arranged opposite to the impeller along the axial direction, and there is a leakage airflow between the impeller back plate and the impeller. The leakage airflow flows through the air film of the thrust bearing assembly and the air film of the first radial bearing. The impeller back plate is provided with a first cooling liquid channel, and cooling liquid flows in the first cooling liquid channel to cool the leakage airflow.

[0034] 1. Impeller; 2. Impeller back plate; 3. Rotor; 4. Bearing housing; 5. First radial bearing; 6. Thrust bearing assembly; 7. Motor; 8. Housing; 9. Diffuser; 10. Second radial bearing; 11. Waterproof adhesive layer;

[0035] 201. First coolant passage; 202. Air duct; 211. First split section; 212. Second split section;

[0036] 401. Second coolant passage;

[0037] 601. First thrust bearing; 602. Second thrust bearing; 603. Thrust disc;

[0038] 801. Cooling air duct; 802. Air duct outlet;

[0039] 901. Diffuser outlet. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] like Figures 1-4 As shown, this application provides an air compressor, including an impeller 1, an impeller back plate 2, a rotor 3, a bearing housing 4, a first radial bearing 5, a thrust bearing assembly 6, and a motor 7. The motor 7 drives the rotor 3 to rotate. The rotor 3 of the motor 7 is axially arranged sequentially through the bearing housing 4, the first radial bearing 5, the thrust bearing assembly 6, the impeller back plate 2, and the impeller 1. The motor 7 and the impeller 1 are located on opposite sides of the impeller back plate 2. The impeller back plate 2 and the impeller 1 are arranged axially opposite each other, and there is a leakage airflow between the impeller back plate 2 and the impeller 1. The leakage airflow flows through the air film of the thrust bearing assembly 6 and the air film of the first radial bearing 5. The impeller back plate 2 has a first cooling liquid channel 201. The number of first cooling liquid channels 201 is not limited. Coolant flows through the first cooling liquid channel 201 to cool the leakage airflow. The thrust bearing assembly 6 and the first radial bearing 5 are both air bearings, and both form an air film during operation. The leakage airflow will flow through the air film due to the influence of air pressure.

[0042] In this way, the first radial bearing 5 and the thrust bearing assembly 6 form air films when in operation as air bearings, and when the compressor is in operation, a leakage flow is generated between the impeller 1 and the back plate 2. Under the action of the air film forming factor, the leakage flow will pass through the air film of the thrust bearing assembly 6 and the air film of the first radial bearing 5. At the same time, the cooling liquid in the first cooling liquid channel 201 in the back plate 2 cools the leakage flow by structural cooling, and the cooled leakage flow has stronger cooling capacity, thereby strengthening the cooling of the thrust bearing assembly 6 and the first radial bearing 5, and solving the problem of over-temperature failure of the air bearings of the compressor in the prior art.

[0043] It should be noted that the first cooling liquid channel 201 is in communication with an external cooling system, and the cooling system can use the cooling system for cooling the motor 7 in the prior art.

[0044] The cooling method of the compressor in the prior art is to use cooling gas. The cooling gas of the compressor is a small part of the flow that is branched off by the exhaust gas at the outlet of the compressor. After being cooled by an external heat exchanger, the small part of the flow is introduced back into the compressor to cool the bearings. In this way, additional equipment is needed to cool the cooling gas, which causes the structure to be bulky, the equipment size to be large, and the cost to be increased. Compared with the above-mentioned method, the compressor provided by the application not only can strengthen the cooling of the bearings, but also uses the leakage flow inside the compressor to cool the leakage flow by the cooling liquid in the internal structure. No external cooling heat exchanger structure is needed, the system reliability is increased, the cost is reduced, the whole machine occupies less space, the structure is more compact, and the system efficiency is increased.

[0045] It should be noted that, due to the compact and complex internal structure of the compressor, in order to more fully show the structure, the compressor provided by the application is shown in the following figures. Figures 1-3 All are shown in a partial position on the basis of the overall cross section, Figure 1 The rotor 3 in the above-mentioned figures is taken along the central axis.

[0046] Regarding how the first cooling liquid channel 201 is formed, in an optional embodiment, the back plate 2 of the impeller is a combined structure including at least a first part 211 and a second part 212. The first part 211 and / or the second part 212 are provided with the first cooling liquid channel 201 on the axially opposite surface. The first part 211 and the second part 212 are connected in the axial direction and can be detachably connected. The first part 211 and the second part 212 are sealingly assembled to ensure that the cooling liquid in the first cooling liquid channel 201 does not flow out. That is, at least one of the first part and the second part is provided with the first cooling liquid channel 201. Figures 1-3 The first cooling liquid channel 201 is shown in the first part 211.

[0047] In this way, the first cooling liquid channel 201 is formed inside the impeller back plate 2, which is difficult to process. The impeller back plate 2 is designed as a split assembly structure, and the impeller back plate 2 is designed as a non-standard part. In this way, the first cooling liquid channel 201 is feasible, and the overall assembly of the compressor is not affected.

[0048] Further, preferably, the stepped surface is arranged between the first part 211 and the second part 212, and the second part 212 is embedded in the first part 211 along the axial direction.

[0049] In a preferred embodiment, the motor 7 is provided with a casing 8, which is arranged around the motor 7 in the circumferential direction and at both axial ends. The bearing seat 4 and the impeller back plate 2 are assembled and connected with the casing 8, and the second cooling liquid channel 401 is arranged between the bearing seat 4 and the casing 8. The cooling liquid flows in the second cooling liquid channel 401 to cool the motor 7. The second cooling liquid channel 401 is in communication with the external cooling system.

[0050] In this way, the cooling liquid in the second cooling liquid channel 401 cools the motor 7, and at the same time, the first radial bearing 5 and the thrust bearing assembly 6 are cooled by heat conduction, further optimizing the cooling effect of the bearings.

[0051] Further, preferably, the motor 7 is provided with the second cooling liquid channel 401 in the circumferential direction and the axial direction. The number of second cooling liquid channels 401 is not limited. In this way, a better cooling effect can be achieved.

[0052] Of course, it is also feasible that only the circumferential direction of the motor 7 is provided with the second cooling liquid channel 401.

[0053] Regarding how the second cooling liquid channel 401 is formed, in an optional embodiment, the second cooling liquid channel 401 is formed on the side of the bearing seat 4 facing the casing 8, and the bearing seat 4 and the casing 8 are sealed and assembled. The sealed connection can prevent the cooling liquid in the second cooling liquid channel 401 from flowing out.

[0054] Of course, in some possible cases, the second cooling liquid channel 401 can also be formed on the casing 8 when the thickness of the casing 8 allows.

[0055] In another preferred embodiment, the end of the motor 7 facing the impeller back plate 2 is provided with a waterproof adhesive layer 11 formed by waterproof adhesive. In this way, the cooling liquid in the second cooling liquid channel 401 can be prevented from affecting the safety of the motor 7, and the waterproof adhesive layer 11 does not affect the efficiency of heat conduction.

[0056] In a more preferred embodiment, in the air compressor, the diffuser 9 is located on the side of the impeller 1, and the side of the diffuser 9 facing the back plate 2 of the impeller is provided with a diffuser outlet 901 capable of guiding the cooling airflow; the back plate 2 of the impeller is provided with a through air channel 202 communicating with the diffuser outlet 901; the casing 8 is provided with a cooling air channel 801 communicating with the through air channel 202, and the cooling air channel 801 extends at least in the axial direction of the casing 8; the side of the rotor 3 away from the impeller 1 is provided with the second radial bearing 10, and the second radial bearing 10 is located at the end of the motor 7 away from the back plate 2 of the impeller; the cooling air channel 801 can guide the cooling airflow to the vicinity of the second radial bearing 10, and the cooling airflow can pass through the gap of the bearing seat 4 to reach the second radial bearing 10 to cool the second radial bearing 10. In order to ensure the flow path of the cooling airflow, the connection between the back plate 2 of the impeller and the casing 8 is a sealed connection at the joint of the cooling air channel 801 and the through air channel 202.

[0057] In this way, the cooling airflow can be cooled by the cooling liquid in the first cooling liquid channel 201, the cooling of the second radial bearing 10 is realized, and the performance of the air compressor is further optimized.

[0058] Further, preferably, the cooling air channel 801 includes a plurality of sub-air channels arranged in the circumferential direction of the casing 8, and all the sub-air channels are connected in series. In this way, the cooling air channel 801 forms an S-shaped channel, and the cooling airflow reciprocates, which prolongs the flow path of the cooling airflow and increases the heat exchange area with the cooling liquid in the first cooling liquid channel 201, thereby improving the cooling effect. Figure 4 A possible example is provided.

[0059] In addition, whether the cooling air channel 801 is arranged in a single line along the axial direction or is arranged in a zigzag reciprocating manner, the air channel outlet 802 of the cooling air channel 801 can be arranged on the circumferential side of the casing 8. In this way, the air channel outlet 802 is arranged at the end of the cooling air channel 801 and communicates with the outside, which is beneficial to enhance the flowability of the cooling airflow, and the heat exchange efficiency can also be enhanced.

[0060] In another specific embodiment, the thrust bearing assembly 6 comprises a first thrust bearing 601, a second thrust bearing 602 and a thrust disc 603; the first thrust bearing 601 is connected with the impeller back plate 2; the second thrust bearing 602 is coaxially arranged with the first thrust bearing 601 and connected with the casing 8; the thrust disc 603 is located between the first thrust bearing 601 and the second thrust bearing 602, and the central part protrudes axially from the first thrust bearing 601 and the second thrust bearing 602; wherein the shaft shoulder of the rotor 3 abuts axially with the thrust disc 603. That is, in the thrust bearing assembly 6, the thrust disc 603 rotates with the rotor 3, so that the gas film is generated between the thrust disc 603 and the first thrust bearing 601 and the second thrust bearing 602. The thrust bearing assembly 6 in this form is applied to the position where the rotor 3 bears axial force, which can make the rotor 3 run more smoothly and the related components wear less.

[0061] The above describes the basic principles of the present application in combination with specific embodiments. However, it should be noted that the advantages, advantages, effects and the like mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the necessary possession of each embodiment of the present application. In addition, the above specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above specific details. The above specific details do not limit the present application to be necessarily implemented with the above specific details.

[0062] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagram. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0063] It should also be noted that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application.

[0064] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0065] It should be understood that the limiting words "first", "second", "third", "fourth", "fifth" and "sixth" used in the embodiments of the present application are only used for more clearly explaining the technical solutions, and cannot be used to limit the protection scope of the present application.

[0066] The above description is given for the purpose of illustration and description. Furthermore, this description does not intend to limit the embodiments of the present application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations of the described aspects and embodiments.

Claims

1. A compressor characterized by, Impeller (1), impeller back plate (2), rotor (3), bearing seat (4), first radial bearing (5), thrust bearing assembly (6), motor (7); The motor (7) drives the rotation of the rotor (3); The rotor (3) is sequentially arranged in the bearing seat (4), the first radial bearing (5), the thrust bearing assembly (6), the impeller back plate (2) and the impeller (1) along the axial direction; The impeller back plate (2) and the impeller (1) are arranged opposite along the axial direction, and there is a leakage airflow between the impeller back plate (2) and the impeller (1), and the leakage airflow flows through the gas film of the thrust bearing assembly (6) and the gas film of the first radial bearing (5); The impeller back plate (2) is provided with a first cooling liquid channel (201), and cooling liquid flows in the first cooling liquid channel (201) to cool the leakage airflow.

2. The compressor of claim 1, wherein The motor (7) is covered by a casing (8), the bearing seat (4) is connected with the casing (8), and a second cooling liquid channel (401) is arranged between the bearing seat (4) and the casing (8), and cooling liquid flows in the second cooling liquid channel (401) to cool the motor (7).

3. The compressor of claim 2, wherein, The diffuser (9) located on the side of the impeller (1) is provided with a diffuser outlet (901) capable of guiding cooling airflow; The impeller back plate (2) is provided with a through air channel (202) in communication with the diffuser outlet (901); The casing (8) is provided with a cooling air channel (801) in communication with the through air channel (202), and the cooling air channel (801) extends at least along the axial direction of the casing (8); The side of the rotor (3) away from the impeller (1) is provided with a second radial bearing (10), and the cooling air channel (801) can guide the cooling airflow to the second radial bearing (10) to cool the second radial bearing (10).

4. The compressor of claim 3, wherein The cooling air channel (801) includes a plurality of branch air channels arranged along the circumference of the casing (8), and all the branch air channels are connected in series.

5. The compressor of claim 3 or 4, wherein The air outlet (802) of the cooling air channel (801) is arranged on the circumferential side of the casing (8).

6. The compressor of claim 2, wherein The motor (7) is provided with the second cooling liquid channel (401) along the circumference and the axial direction.

7. The compressor of claim 2, wherein The bearing seat (4) is provided with the second cooling liquid channel (401) on the side facing the casing (8), and the bearing seat (4) and the casing (8) are sealingly connected.

8. The compressor of claim 2, wherein, The end of the motor (7) facing the impeller back plate (2) is provided with a waterproof adhesive layer (11).

9. The compressor of claim 2, wherein, The thrust bearing assembly (6) comprises: A first thrust bearing (601) connected with the impeller back plate (2); A second thrust bearing (602) coaxially arranged with the first thrust bearing (601) and connected with the casing (8); A thrust disc (603) located between the first thrust bearing (601) and the second thrust bearing (602), and the central part protrudes axially from the first thrust bearing (601) and the second thrust bearing (602). The shaft shoulder of the rotor (3) is in abutment with the thrust disc (603) in the axial direction.

10. The compressor of claim 1, wherein, The back plate (2) of the impeller is a combined structure comprising at least a first part (211) and a second part (212), and the first part (211) and / or the second part (212) is provided with the first cooling liquid channel (201) on the opposite side in the axial direction.

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